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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <button>这是按钮，请点击</button>
    <button>这是按钮，请点击</button>
</body>
</html>
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        console.log("这是一次性定时器");
    },1000);

    // 多次函数
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        console.log("这是多次性定时器");
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